Scopus is a curated abstract and citation database of scholarly literature across 240 disciplines, covering documents dating back to 1788, cited references from 1970 onward, author profiles, books, publishers and institutional profiles.

The SPIE Digital Library is the world's largest collection of optics and photonics applied research. With more than 550,000 papers spanning biomedicine, communications, sensors, defense and security, manufacturing, electronics, energy, and imaging, the SPIE Digital Library is the most extensive research database available on optics and photonics research.

This database has bibliographic records with abstracts for about 70% of the science citations and 60% of the social sciences citations. Contains Science Citation Index Expanded 1900-; Social Sciences Citation Index 1956-; and Arts & Humanities Citation Index from 1975. It allows the identification of key articles in a discipline and to search by cited reference that is to trace references that refer to a particular work or author.

Instrumentation Abstract Service is part of Astrophysics Data System (ADS), and is operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS is a digital library portal for researchers in astronomy and physics. The ADS maintains three bibliographic databases containing more than 10.1 million records including astronomy and astrophysics, physics, and arXiv e-prints. All abstracts and articles in the ADS are copyrighted by the publisher and their use is free for personal use only.

This comprehensive collection covers both contemporary and historical issues within the field of Indigenous studies. Its multidisciplinary and interdisciplinary framework encompasses anthropology, community development, cultural studies, economics, education, health, history, human geography, law, land rights, literature, politics, policy making, (post)-colonial studies, psychology, race studies, sociology and visual & performing arts.